were in the crowd at today's race that final mile, mile 26, it had been dedicated to victims of the sandy hook shooting that is of significance because there were 26 adults and kids killed in december if you look at this mile marker it has new town's logo. this has been a rough couple months for families up there. first the horror and grief of that shooting now some of them have witnessed a terror act that has a lot of us confused and upset tonight. >>> many horrific images from this tragedy one was the first seen by many folks all over the world, 78-year-old bill of washington state, just about to cross the finish line when he was knocked to the ground by the first blast. you can see he fell down right in front of a photographer and then surrounded by officers. this picture quickly went viral turns out he was only 5 feet away from the blast. >> well, i was heading for the finish line, feeling pretty good about my time everything looked real good i got within 15 feet of the finish marker. terrible explosion so loud it deafened everything the shock waves must have hit my body my legs start